For Diesels the code P0071 is the inlet air temp sensor (inlet air temp sensor rationality), not to be confused with intake air temp sensor (on intake by injector rail) or ambient air temp sensor (on LH side of core support between radiator and LH headlamp). The inlet air temp sensor is mounted to the air intake breather, right after the air filter box, I think a couple model years the sensor was on the filter box too.
Since the code came right back on after you cleared it with a battery disconnect, maybe the sensor is bad. There was also an old service bulletin to flash a new program the PCM/ECM for sensor rationality. That bulletin was published back in 2006, its possible your truck has never been to the dealer to have a newer flash but this could be the fix too.
This post was edited by 4play at 23:21:30 03/05/14.
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